The first negative ad against Democratic presidential front-runner Joe Biden is set to run on Friday, sponsored by a rival with arguably the least chance of capturing his party’s nomination, former Alaska Sen. Mike Gravel.

The paid spot attacks Biden from the Left for his record on foreign policy, busing, criminal justice, and abortion. Gravel’s presidential campaign, which is run by two New York teenagers, bought a minute-long ad spot to play Friday during MSNBC’s Deadline: White House, which airs at 4 p.m.